Rivet bucking gun



June 20, 1950 .1. H. SARGENT ETAL RIVET BUCKING GUN Filed July 19, 1948 James h. Sargenf Clarence W. Harmon Joseph I? Harmon Marvin Elwood Harman Howard H. Harmon James I-/. Sargent, Jr. Joseph L. Sarge/n IN V EN TORS.

BY Mm all Patented June 2Q, 1950 JamesH. Sargent, Clarence W. Harmon, Joseph R. Harmon, Marvin Elwood Harmon, Howard H. Harmon, James H. Sargent, J r., and Joseph L. Sargent, Amonate, Va.

Application July 19, 1948, Serial No. 39,436

1 Claim.

This invention appertains to novel and useful improvements in devices for use in riveting.

An object of this invention is to back a rivet while riveting operations proceed through the medium of a tool which includes a sleeve having a bore and a counterbore with a plunger in the bore and an inertia member in the counterbore and three springs involved, two of which have relatively different compressive capacities engaging the inertia member while the other reacts on the end of the sleeve and a flange on the plunger.

other objects and features of novelty will become apparent to those skilled in the art, and following the description of the preferred form of the invention, illustrated in the accompanying drawings, wherein:

Figure 1 is a sectional view of the preferred form of the invention;

Figure 2 is a sectional view taken on the line 2-2 of Figure 1 in the direction of the arrows;

Figure 3 is a sectional view taken substantially on the line 3--3 of Figure 1 in the direction of the arrows; and

Figure 4 is a transverse sectional view taken on the line 4--4 of Figure 1 in the direction of the arrows.

This invention has been developed in order to provide an improved device for bucking rivets and the like during the operation of applying the rivets wherever it is found desirable.

A sleeve I is provided with a bore I2 and a counterbore I4. An inertia member I6 is slidably received in the counterbore l4 and means for resiliently biasing the said inertia member is provided.

The preferred means consists of a relatively heavy spring I 8 which engages a closure generally indicated at 20 and reacts on the inertia member l6. A secondary spring 22 is concentric with the relatively heavy spring [8 and is of lighter compressive characteristics. This last-mentioned spring 22 also engages the closure 20 and reacts on the inertia member l6. An aperture 24 is provided at one end of the inertia member in order to seat the pertinent end of the spring 22 therein.

The said closure 28 has an opening therein and a plurality of threads in the interior of the opening. Complemental threads 28 are provided on 2 the exterior surface of the sleeve l0 adjacent the end of the counterbore. To this means the closure 20 may be detachably (threadedly) received on the end of the sleeve 18 adjacent the terminal of the counterbore.

A slot 30 is provided in the opposite end of the said closure 20 and accommodates curved terminal portions 32 and 34, respectively, of the handle 36. It is seen that the handle is formed of one single piece, the portions 32 and 34 being formed by imply bending the material at substantially right angles to the adjacent material which is actually a metal strap.

A plunger 38 is reciprocatively received in the bore l2 and has an end thereof contacting the inertia member IS. The opposite end of the said plunger 38 has an enlargement 48 with a groove 42 extending therearound in order that the strain in the material will be dispersed properly in order that flattening will not occur to an excessive amount. A similar groove is provided on the exterior surface on the end of the sleeve l8 adjacent the bore l2. This groove also serves a similar function.

A conventional bucking recess 46 is provided in the end of the plunger 38 in order to receive the rivet proper therein.

A spring 48, preferably of the fiat type, is interposed between the end of the sleeve l8 and the enlargement or flange 48 of the plunger 38. This spring obviously reacts on the sleeve Ill and the plunger in utility of the invention.

Vibration is transmitted to the plunger 38, through the spring 48. Thus, the initial thrust in part is transmitted to the sleeve. Then, the secondary thrust of a larger proportion is transmitted from the inertia member "5 through the primary spring 22, reacting on the closure 28. The remainder of the thrust from the inertia member (the inertia member having been slowed due to the reaction of the spring v22) is transmitted to the relatively heavy spring l8. Thence, the thrust extends to the closure 28.

While there has been described and illustrated but a preferred form of the invention, it is apparent that variations may be made without departing from the spirit thereof. Therefore, limitations are sought only in accordance with the scope of the following claim.

EN: ma

Having described the invention, what is claimed as new is:

A tool comprising a sleeve having a bore and a counterbore communicating therewith to thereby form a shoulder at their junction, a plunger in said bore, an inertia. member slidably disposed in said counterbore and adapted to engage said shoulder to limit the movement of the member, a closure, means for securing said closure directly to said sleeve at the end of said counterbore and 10 a part of said closure engaging the outer surface of said sleeve, arelatively heavy spring seated on said closure and reacting on {said inertia mem her, and a relatively light spring seated on said closure and reacting on said inertia member, said plunger having an enlargement at one end thereof forming a flange, the opposite and contacting said inertia member, a spring seating on the end of the sleeve at the end of said here and reacting 4 on said flange, and said plunger having a groove therein to inhibit spreading of the material of said plunger occasioned by shock.

JAMES H. SARGENT. CLARENCE W. HARMON. JOSEPH R. HARMON. MARVIN ELWOOD HARMON. HOWARD H. HARMON. JAMES H. SARGENT, JR. JOSEPH L. SARGENI.

REFERENCES CITED The following references are of record in the file of this patent:

2,349,341 .Disse Mar. '23, 1944 

